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TCP J11584987-4723224: new transient (12.8 mag) in Centaurus

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SPK
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TCP J11584987-4723224: new transient (12.8 mag) in Centaurus

TCP J11584987-4723224 (UG/N)

RA 11h58m49.87s, DE -47"23'22.4" (J2000.0)
2020 March 8.1806 UT, mag. 12.9 (CCD, unfiltered)
Discoverer: Brazilian Transient Search (BraTS)
http://www.cbat.eps.harvard.edu/unconf/followups/J11584987-4723224.html

2020 03 08.18063 UT
Discovered by L. Amaral, C. Jacques, C. Colesanti, E. Pimentel, I. Mussi, J. Ribeiro, M. Domingues, J. Amancio, P. Holvorcem, T. Napoleao on behalf of the Brazilian Transient Search – BraTS – at Observatorio Campo dos Amarais, Bilac, Brazil in three frames with 60 seconds exposure using an 306mm f/2.9 reflector + CCD with magnitude 12.9 under limiting mag = 19.5. Nothing is visible at this location on the previous frame (limiting mag = 19.5) taken on 2020 Mar. 4.85896 UT. Transient at 1.7' from galaxy PGC 502251 and ~14 degrees of Galactic plane. Possible SN or nova.

2020 03 08.2577 UT
A progenitor candidate is GSC2.3 S45E041474 (Bjmag. 21.78) with position end figures 50.00s in RA and 22.1" in DE (J2000.0), which is 1.4" ENE of the reported position of the transient. This candidate is probable identical to the UV source GALEX J115849.6-472321 (fuv_mag. 21.2). The transient is confirmed by recent ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S and Kochanek et al. 2017PASP..129j4502K) observations: 2020 March 7.144 UT, gmag. fainter than 16.2; 8.258, gmag. 12.8. No previous brightenings were recorded since 2014 May 15; complete light curve and data at https://asas-sn.osu.edu/light_curves/2aa3b838-03f3-4b6c-afd8-f3e284ce11bd --- Patrick Schmeer (Saarbrücken-Bischmisheim, Germany)

Discovery and reference images:
https://wis-tns.weizmann.ac.il/system/files/comment_files/AT_2020efm_OCA...

Spectroscopy, precise astrometry, and multiband as well as time-resolved photometry are urgently required.

Clear skies,
Patrick

SPK
SPK's picture
Slowly fading

Latest ASAS-SN Sky Patrol observation: 2020 March 9.326 UT, gmag. 13.0 (i.e. 0.2 magnitudes fainter than the night before); light curve at https://asas-sn.osu.edu/light_curves/e4c7a4e6-07ac-43c3-b6b9-d965fd2a1734

Clear skies,
Patrick

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